| Sinclair ZX Spectrum cass. |  Cash Controller | 1983 | Shepherd Soft., Richard |
| Sinclair ZX Spectrum cass. | Cassette 50 | 1983 | Cascade Games, Ltd. |
| Sinclair ZX Spectrum cass. | Castle Spellerous | 1983 | Sinclair Research, Ltd. |
| Sinclair ZX Spectrum cass. | Caterpilla | 1983 | Spectrum Games |
| Sinclair ZX Spectrum cass. | Catterpillar Model 2 | 1983 | CDS Soft., Ltd. |
| Sinclair ZX Spectrum cass. | Caveman | 1983 | CRL Group PLC London, England |
| Sinclair ZX Spectrum cass. | Cavern Fighter Model BBS 00110 | 1983 | Bug-Byte London, England |
| Sinclair ZX Spectrum cass. | Cárie | 1983 | Timex Portugal |
| Sinclair ZX Spectrum cass. | Cells and Serpents | 1983 | ASP Soft. |
| Sinclair ZX Spectrum cass. | Centimunch | 1983 | TNT Soft. |
| Sinclair ZX Spectrum cass. | Centipede | 1983 | Vectis Soft. |
| Sinclair ZX Spectrum cass. | Centipede + Painter | 1983 | C-Tech |
| Sinclair ZX Spectrum cass. | Centipedes | 1983 | EMM Soft. Germany |
| Sinclair ZX Spectrum cass. | Centropods Model RSS 316 | 1983 | Rabbit Soft. |
| Sinclair ZX Spectrum cass. | Challenge | 1983 | Temptation Soft. |
| Sinclair ZX Spectrum cass. | Champions! | 1983 | Peaksoft |
| Sinclair ZX Spectrum cass. | Championship Darts | 1983 | Shadow Soft. |
| Sinclair ZX Spectrum cass. | Chequered Flag Model G31/S | 1983 | Sinclair Research, Ltd. |
| Sinclair ZX Spectrum cass. | Chess - The Turk | 1983 | Oxford Computer Publishing |
| Sinclair ZX Spectrum cass. |  Chess - The Turk | 1983 | ABC Soft. Spain |
| Sinclair ZX Spectrum cass. | Chess - The Turk - French Version | 1983 | Oxford Computer Publishing |
| Sinclair ZX Spectrum cass. | Chess Tutor | 1983 | Artic Computing, Ltd. |
| Sinclair ZX Spectrum cass. | Chess Tutor 1 | 1983 | Sinclair Research, Ltd. |
| Sinclair ZX Spectrum cass. | Chess Model G10/S | 1983 | Sinclair Research, Ltd. |
| Sinclair ZX Spectrum cass. | Chocman | 1983 | Hyperion Soft. |
| Sinclair ZX Spectrum cass. | Chomper | 1983 | ZX Computing |
| Sinclair ZX Spectrum cass. | Chopper Rescue | 1983 | Blaby Computer Games |
| Sinclair ZX Spectrum cass. | Chopper X-1 | 1983 | R&R Soft. |
| Sinclair ZX Spectrum cass. | Chuckman Model S007 | 1983 | Custom Cables International |
| Sinclair ZX Spectrum cass. | City Lander | 1983 | Sinclair User |
| Sinclair ZX Spectrum cass. | Clone-It | 1983 | ASP Soft. |
| Sinclair ZX Spectrum cass. | Close-In Model D6004 | 1983 | Pulsonic |
| Sinclair ZX Spectrum cass. | Colossal Adventure | 1983 | Level 9 Computing |
| Sinclair ZX Spectrum cass. | Colour Clash Model G5002 | 1983 | Romik Soft., Ltd. |
| Sinclair ZX Spectrum cass. | Comecocos + Froggy | 1983 | Indescomp Spain |
| Sinclair ZX Spectrum cass. |  Computer Brag | 1983 | Turtle Soft. |
| Sinclair ZX Spectrum cass. | Computer Darts | 1983 | AVB Soft. |
| Sinclair ZX Spectrum cass. | Computer Scrabble Model G25/S | 1983 | Sinclair Research, Ltd. |
| Sinclair ZX Spectrum cass. | Confrontation | 1983 | MC Lothlorien |
| Sinclair ZX Spectrum cass. | Confusion | 1983 | Blaby Computer Games |
